docs: def extended_help_option(extended_help=None, *param_decls, **attrs):
      """
      Based on the click.help_option code.
  
      Adds a ``--extended-help`` option which immediately ends the program
      printing out the extended extended-help page. Defaults to using the
      callback's doc string, but can be given an explicit value as well.
  
      This is intended for use as a decorator on a command to provide a 3rd level
      of help verbosity suitable for use as a manpage (though not formatted as such explicitly).
  
      Like :func:`version_option`, this is implemented as eager option that
      prints in the callback and exits.
  
      All arguments are forwarded to :func:`option`.
      """
  
      def decorator(f):
          def callback(ctx, param, value):
              if value and not ctx.resilient_parsing:
                  if not extended_help:
                      ctx.command.help = ctx.command.callback.__doc__
                      click.echo(ctx.get_help(), color=ctx.color)
                  else:
                      ctx.command.help = extended_help
                      click.echo(ctx.get_help(), color=ctx.color)
                  ctx.exit()
  
          attrs.setdefault('is_flag', True)
          attrs.setdefault('expose_value', False)
          attrs.setdefault('help', 'Show extended help content, similar to manpage, and exit.')
          attrs.setdefault('is_eager', True)
          attrs['callback'] = callback
          return click.option(*(param_decls or ('--extended-help',)), **attrs)(f)
  
      return decorator